Table of Contents
Advertisement
R
5.9.3
Recommendation for Intel Platforms
The following tables contain examples of components that meet Intel's recommendations, when
configured in the topology of Figure 27.
Table 15. Component Recommendations – Inductor
TDK MLF2012A4R7KT
Murata LQG21N4R7K00T1
Murata LQG21C4R7N00
Table 16. Component Recommendations – Capacitor
Kemet T495D336M016AS
AVX TPSD336M020S0200
Table 17. Component Recommendation – Resistor
Value
1
To satisfy damping requirements, total series resistance in the filter (from VCC
of the capacitor) must be at least 0.35 . This resistor can be in the form of a discrete component
or routing or both. For example, if the chosen inductor has a minimum DCR of 0.25 , then a
routing resistance of at least 0.10
rule (2 ). For example, if using discrete R1 (1
inductor) should be less than 2.0 - 1.1 = 0.9 ; this precludes the use of some inductors and sets a
maximum trace length.
Other routing requirements:
The capacitor (C) should be close to the PLL1 and PLL2 pins, < 0.1
do not count towards the minimum damping R requirement.
The PLL2 route should be parallel and next to the PLL1 route (i.e., minimize loop area).
The inductor (L) should be close to C. Any routing resistance should be inserted between
VCC
CORE
Any discrete resistor (R) should be inserted between VCC
®
Intel
815 Chipset Platform Design Guide
Part Number
Value
4.7 H
4.7 H
4.7 H
Part Number
Value
33 F
33 F
Tolerance
Power
10%
1/16 W
and L.
Tol.
SRF
10%
35 MHz
10%
47 MHz
30%
35 MHz
Tolerance
ESL
20%
2.5 nH
20%
2.5 nH
Resistor may be implemented with trace resistance,
in which case a discrete R is not needed. See
Figure 28.
is required. Be careful not to exceed the maximum resistance
1%), the maximum DCR of the L (trace plus
System Bus Design Guidelines
Rated
DCR (Typical)
Current
30 mA
0.56
(1
max.)
30 mA
0.7
( 50%)
30 mA
0.3
max.
ESR
0.225
0.2
Note
to the top plate
CORE
per route. These routes
and L.
CORE
61
Advertisement
Table of Contents
